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WO1992015673A1 - Clonage et expression de renilla luciferase - Google Patents

Clonage et expression de renilla luciferase Download PDF

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Publication number
WO1992015673A1
WO1992015673A1 PCT/US1991/001614 US9101614W WO9215673A1 WO 1992015673 A1 WO1992015673 A1 WO 1992015673A1 US 9101614 W US9101614 W US 9101614W WO 9215673 A1 WO9215673 A1 WO 9215673A1
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Prior art keywords
luciferase
sequence
molecule
dna
renilla
Prior art date
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PCT/US1991/001614
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English (en)
Inventor
Milton Joseph Cormier
William Walter Lorenz
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The University Of Georgia Research Foundation, Inc.
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Publication date
Application filed by The University Of Georgia Research Foundation, Inc. filed Critical The University Of Georgia Research Foundation, Inc.
Priority to PCT/US1991/001614 priority Critical patent/WO1992015673A1/fr
Priority to ES91908378T priority patent/ES2142801T3/es
Priority to DE69131780T priority patent/DE69131780T2/de
Priority to DK91908378T priority patent/DK0575319T3/da
Priority to EP91908378A priority patent/EP0575319B1/fr
Priority to CA002105984A priority patent/CA2105984C/fr
Priority to JP03506544A priority patent/JP3126980B2/ja
Publication of WO1992015673A1 publication Critical patent/WO1992015673A1/fr
Priority to GR20000400307T priority patent/GR3032608T3/el

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/0004—Oxidoreductases (1.)
    • C12N9/0069—Oxidoreductases (1.) acting on single donors with incorporation of molecular oxygen, i.e. oxygenases (1.13)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y113/00—Oxidoreductases acting on single donors with incorporation of molecular oxygen (oxygenases) (1.13)
    • C12Y113/12—Oxidoreductases acting on single donors with incorporation of molecular oxygen (oxygenases) (1.13) with incorporation of one atom of oxygen (internal monooxygenases or internal mixed function oxidases)(1.13.12)
    • C12Y113/12005—Renilla-luciferin 2-monooxygenase (1.13.12.5), i.e. renilla-luciferase

Definitions

  • This invention relates to the field of genetic engineering and is particularly related to the expression of proteins by techniques involving genetic engineering.
  • the Renilla also known as sea pansies, belong to a class of coelenterates known as the anthozoans.
  • anthozoans include Cavarnularia, Ptilosarcus, Stylatula, Acanthoptilum, and Parazoanthus. All of these organisms are bioluminescent and emit light as a result of the action of an enzyme (luciferase) on a substrate (luciferin) under appropriate biological conditions.
  • luciferase an enzyme
  • luciferin luciferin
  • Prior studies have demonstrated that all of the above-mentioned anthozoans contain similar luciferases and luciferins. See, for example, Cormier e_t a_l., J. Cell. Physiol.
  • the luciferases and luciferins from each of these anthozoans will cross- react with one another to produce the characteristic blue luminescence observed in Renilla extracts.
  • Each of these luciferases has similar biochemical properties, and the biochemical requirements for bioluminescence are identical regardless of the anthozoan from which the luciferase was derived.
  • Firefly luciferase which is a molecule of significantly different structure that does not react with Renilla-like luciferins, is one molecule that has been proposed for use as such labels.
  • firefly luciferase suffers from a number of deficiencies that make this molecule less than optimal in biological assays.
  • ATP acts as a trigger of the firefly luciferase system, and the ubiquitous nature of ATP makes control of this variable difficult.
  • the photoprotein aequorin (which consists of apoaequorin bound to a coelenterate luciferin molecule) and Renilla luciferase both utilize the same coelenterate luciferin, and the chemistry of light emission in both cases has been shown to be the same.
  • aequorin luminescence is triggered by calcium, does not require dissolved oxygen, and represents a single turnover event.
  • Renilla luciferase is not triggered by calcium and requires dissolved oxygen in order to produce light in the presence of coelenterate luciferin.
  • Renilla luciferase also acts as a true enzyme, catalyzing a long-lasting luminescence in the presence of saturating levels of luciferin.
  • Renilla luciferase because of its enzymatic ability, should be detectable at levels 1 to 2 orders of magnitude lower than aequorin. Furthermore, Renilla luciferase is known to be relatively stable to heat, an important consideration for assays that often involve incubation at physiological temperatures. Accordingly, Renilla luciferase is a potentially useful label for biological and other assays.
  • Renilla live on the ocean bottom, about 30 to 100 feet deep, and must be collected by dregging. From 1 kg of Renilla (about
  • Figure 1 is the nucleotide sequence of a clone that contains a Renilla reniformis luciferase cDNA sequence.
  • Figure 2 is the amino acid sequence derived from the open reading frame of the Renilla luciferase cDNA shown in Figure 1.
  • Figure 3 is the recombinant luciferase amino acid sequence with different types of underlining to show the location of peptides obtained by digestion of native luciferase with V-8 protease.
  • Figure 4 is a table showing the amino acid sequence of Renilla reniformis peptides obtained by V-8 protease digestion. Regions of low degeneracy that were selected for preparation of oligonucleotide probes are shown by boxes. The probes are shown at the bottom part of the Figure.
  • Figure 5 is a schematic representation of a restriction enzyme map for Renilla luciferase cDNA.
  • the lower portion of Figure 5 is a schematic representation of sequencing strategy for Renilla luciferase cDNA.
  • Figure 6 is a map of a Renilla luciferase expression plasmid.
  • Figure 7 is a schematic diagram of the control region of the plasmid pTZRLuc-1.
  • Figure 8 is a schematic diagram of the purification scheme used to purify recombinant luciferase.
  • the present invention provides genetic mater ⁇ ial encoding Renilla luciferase.
  • the genetic material can be used to produce the enzyme for use as luminescent tags in bioluminescence assays and for other purposes for which such labels are desirable. Additionally, the genetic material can be used as a source of probes that can be used in nucleic acid hybridization assays for the identification of other luciferase genes from related organisms. Fragments of the enzyme can be used to prepare antibodies for the purpose of identifying luciferase genes from related organisms. Specific genetic materials and luciferase proteins are disclosed in the following detailed description and examples.
  • the present inventors have identified and obtained for the first time genetic material encoding luciferase from the coelenterate genus Renilla which previously has been available only in limited quantities. Since luciferases have a number of uses as a bioluminescent label and since Renilla luciferase has a number of properties that make it particularly useful as a label, availability of the enzyme in significant quantities in pure form provides a significant commercial advantage over prior sources.
  • the Renilla genetic material also provides a source of nucleic acid probes for use in hybridization techniques that allow location of luciferase genes in related organisms.
  • the cDNA sequence for a clone that contains a Renilla reniformis luciferase gene is set forth in Figure 1, with the translated cDNA amino acid sequence being set forth in Figure 2.
  • the coding sequence of the clone in Figure 1 begins at nucleotide 10 and continues to a stop codon at nucleotide 944.
  • Figure 3 shows a complete recombinant Renilla luciferase amino acid sequence as produced by an expression system.
  • the present invention has specifically contemplated each and every possible variation of polynucleotide that could be made by selecting combinations based on the possible codon choices listed in Figure 1 (with the reading frame beginning at position 1 of Figure 1) and in Table 1 (below), and all such variations are to be considered as being specifically disclosed and equivalent to the sequence of Figure 1.
  • Codons are preferably selected to fit the host cell in which the enzyme is being produced. Selection of codons to maximize expression of proteins in a heterologous host is a known technique.
  • Other DNA molecules that code for such pep ⁇ tides can readily be determined from the list of codons in Table 1 and are likewise contemplated as being equi- valent to the DNA sequence of Figure 1.
  • any discussion in this appli ⁇ cation of a replacement or other change in a peptide is equally applicable to the corresponding DNA sequence or to the DNA molecule, recombinant vector, or transformed microorganism in which the sequence is located (and vice versa) .
  • Each 3-letter triplet represents a trinucleotide of DNA having a 5' end on the left and a 3' end on the right.
  • the RNA code is the same except that ⁇ (uracil) replaces T.
  • DNA (or corresponding RNA) molecules of the invention can have additional nucleotides preceding or following those that are specifically listed.
  • poly A can be added to the 3'-terminal; a short (e.g., fewer than 20 nucleotides) sequence can be added to either terminal to provide a terminal sequence corresponding to a restriction endonuclease site, stop codons can follow the peptide sequence to terminate translation, and the like.
  • DNA molecules containing a promoter region or other control region upstream from the gene can be produced. All DNA mole ⁇ cules containing the sequences of the invention will be useful for at least one purpose since all can minimally be fragmented to produce oligonucleotide probes and be used in the isolation or detection of DNA from biologi ⁇ cal sources.
  • Renilla luciferase means the luciferase enzyme isolated from a member of the genus Renilla or an equivalent molecule obtained from any other source or synthetically.
  • equivalent is meant, when referring to two nucleotide sequences, that the two nucleotide sequences in question encode the same sequence of amino acids. When “equivalent” is used in referring to two peptides, it means that the two peptides will have substantially the same amino acid sequence.
  • “equivalent” refers to a property
  • the property does not need to be present to the same extent (e.g., two peptides can exhibit different rates of the same type of enzymatic activity) , but the properties are preferably substantially the same.
  • “Complementary,” when referring to two nucleotide sequences, means that the two sequences are capable of hybridizing, preferably with less than 25%, more preferably with less than 15%, even more preferably with less than 5%, most preferably with no mismatches between opposed nucleotides.
  • Preferred hybridizing conditions are set forth in the Examples.
  • substantially varies with the context as understood by those skilled in the relevant art and generally means at least 70%, preferably means at least 80%, more preferably at least 90%, and most preferably at least 95%.
  • the phrase “substantially identical” includes complete identity as well as less than complete identity (e.g., of amino acid sequences or enzymatic activity) as established by the prior definition of “substantially.”
  • isolated refers to, e.g., a peptide, DNA, or RNA separated from other peptides, DNAs, or RNAs, respectively, and being found in the presence of (if anything) only a solvent, buffer, ion or other component normally present in a biochemical solution of the same.
  • Isolated does not encompass either natural materials in their native state or natural materials that have been separated into components (e.g., in an acrylamide gel) but not obtained either as pure substances or as solutions.
  • the phrase "replaced by” or “replacement” as used herein does not necessarily refer to any action that must take place but to the peptide that exists when an indicated “replacement” amino acid is present in the same position as the amino acid indicated to be present in a different formula (e.g., when leucine instead of valine is present at amino acid 11).
  • the DNA sequence of the Renilla lucif ⁇ erase gene has been identified, it is possible to produce a DNA gene entirely by synthetic chemistry, after which the gene can be inserted into any of the many available DNA vectors using known techniques of recombinant DNA technology.
  • nucleotide sequences greater than 100 bases long can be readily synthesized on an Applied Biosyste s Model 380A DNA Synthesizer as evidenced by commercial advertising of the same (e.g., Genetic Engineering News, November/December 1984, p. 3).
  • Such oligonucleotides can readily be spliced using, among others, the technique of preparing overlapping comple ⁇ mentary sequences (e.g, 1-100 of coding strand, 0-50 and 51-150 of complementary strand, 101-200 of coding strand, etc.), followed by hybridizing and ligating the strands.
  • Such techniques are well known and are described in detail in, for example, Davis e_t al. ,
  • peptide fragments based on these sequences and fragments and full length sequences representing minor variations thereof will have at least some of the biological activities of luciferase and will therefore be useful in appropriate circumstances.
  • fragments of the luciferase enzyme sequence can readily be prepared and can be screened for use as luciferin binding site models.
  • Peptide synthesizers can be used to prepare small polypeptide tragments (e.g., less than 100 amino acids) or techniques of genetic engineering can be used to prepare larger fragments.
  • a simple screening procedure that will identify suitable polypeptide fragments consists of attaching a suitable substrate, e.g., a coelenterate luciferin molecule, to an affinity column and capturing peptide fragments that are retained by the bound substrate.
  • a suitable substrate e.g., a coelenterate luciferin molecule
  • Such peptides can also be used (and are indeed more likely to be used) as immunogens for the preparation of antibodies that can be used to screen for the expression of a luciferase by a genetically engineered organism, in which case the bound substrate will be an antibody or similar molecule that binds specifically to Renilla luciferase.
  • modified peptides can be tested for ability to catalyze the emission of light from coelenterate luciferin by the same techniques described below for the recombinant Renilla luciferase molecule.
  • Peptides in which more than one replacement has taken place can readily be tested in the same manner.
  • Preferred peptides differ at no more than 12, more preferably no more than 5, amino acids in any contiguous group of 20 amino acids. Substitutions of amino acids, when they occur, are preferably from within standard conservative groups.
  • Examples include alkali, alkaline earth, and other metal salts of carboxylic acid resi ⁇ dues, acid addition salts (e.g., HC1) of amino resi- dues, and zwitterions formed by reactions between carboxylic acid and amino residues within the same molecule.
  • acid addition salts e.g., HC1
  • zwitterions formed by reactions between carboxylic acid and amino residues within the same molecule.
  • genes and corresponding proteins can be prepared by the totally synthetic techniques dis ⁇ cussed above, in preferred embodiments of the invention genetic information is obtained from natural sources and identified as described herein.
  • the genetic mater ⁇ ial is first obtained in the form of a gene library, using any of numerous existing techniques. The first of these is to randomly shear genomic DNA and insert this sheared material into expression vectors. If enough recombinants are generated, there is a good probability of having at least one recombinant in the population which is expressing a fusion protein corre ⁇ sponding to the enzyme of interest.
  • Another strategy for preparing gene libraries is to make complementary DNA (cDNA) copies of the total mRNA population of the organism and to clone these as recombinant molecules in expression vectors.
  • cDNA complementary DNA
  • the expected nature of the organism i.e., it was expected to have the characteristics of a eucaryote
  • introns might be present within the coding region of the desired gene.
  • introns do not preclude use of sheared genomic DNA, they increase the number of recombinants which must be screened and make further analyses substantially complicated.
  • use of a cDNA library to obtain Renilla genes is preferred.
  • Such a library was generated in the laboratory of the inventors and screened for expression of a gene product having luciferase activity.
  • Patent 4,683,202 which is herein incorporated by reference. Since Renilla specimens are readily available from the oceans of the world, and since PCR probes can be prepared using the sequences set forth in this specification, it is possible to obtain any desired segment of the sequences set forth herein using the PCR technique and naturally available sources of Renilla genomic material. A specific example of such a technique for isolating the Renilla luciferase chromosomal gene is described in the examples that follow. The cloned gene can then be inserted into commercial vectors and expressed.
  • Renilla protein can be enhanced by including multiple copies of the gene in a trans ⁇ formed host; by selecting a vector known to reproduce in the host, thereby producing large quantities of pro- tein from exogeneous inserted DNA (such as p ⁇ C8; ptacl2; pIN-III-ompAl, 2, or 3; pOTS; pASl; or pKK223- 3); or by any other known means of enhancing peptide expression.
  • a vector known to reproduce in the host such as p ⁇ C8; ptacl2; pIN-III-ompAl, 2, or 3; pOTS; pASl; or pKK223- 3
  • pro- tein from exogeneous inserted DNA
  • pOTS such as p ⁇ C8; ptacl2; pIN-III-ompAl, 2, or 3
  • pOTS such as pASl; or pKK223- 3
  • Such peptides are typically prepared by using the promoter region of a gene known to be ex ⁇ pressed in a host and inserting nucleotides that encode all or a major portion of the amino acid sequence of the invention into the genetic sequence for the host protein.
  • fused proteins include ⁇ - galactosidase fused proteins.
  • the fused peptide can be designed so that a site recognized by a proteolytic enzyme is present at the junction between the two fused proteins. The proteolytic enzyme can then be used to cleave the expressed protein so that the desired luciferase enzyme is available in pure form. In all cases, a Renilla luciferase will be ex ⁇ pressed when the DNA sequence is functionally inserted into the vector.
  • a gene By “functionally inserted” is meant in proper reading frame and orientation, as is well understood by those skilled in the art. Typically, a gene will be inserted downstream from a promoter and will be followed by a stop codon, although production as a hybrid protein (possibly followed by cleavage) may be used, if desired.
  • Patent 4,304,863 discloses a pro ⁇ cess for producing bacteria by genetic engineering in which a hybrid plasmid is constructed and used to transform a bacterial host.
  • U.S. Patent 4,419,450 discloses a plasmid useful as a cloning vehicle in re- combinant DNA work.
  • U.S. Patent 4,362,867 discloses recombinant cDNA construction methods and hybrid nuc ⁇ leotides produced thereby which are useful in cloning processes.
  • U.S. Patent 4,403,036 discloses genetic reagents for generating plasmids containing multiple copies of DNA segments.
  • U.S. Patent 4,363,877 disclo ⁇ ses recombinant DNA transfer vectors.
  • Patent 4,356,270 discloses a recombinant DNA cloning vehicle and is a particularly useful disclosure for those with limited experience in the area of genetic engineering since it defines many of the terms used in genetic engineering and the basic processes used therein.
  • U.S. Patent 4,336,336 discloses a fused gene and a method of making the same.
  • U.S. Patent 4,349,629 discloses plas ⁇ mid vectors and the production and use thereof.
  • U.S. Patent 4,332,901 discloses a cloning vector useful in recombinant DNA.
  • Renilla luciferase and genetic material of the invention will become available for use in the development of hybridi ⁇ zation assays or in any other type of assay utilizing these materials.
  • Transferring the Renilla luciferase cDNA which has been isolated to other expression vectors will produce constructs which improve the ex ⁇ pression of luciferase in E. coli or express the polypeptide in other hosts.
  • oligonucleotide probes based on the principal and variant nucleotide sequences disclosed herein. Such probes can be considerably shorter than the entire sequence but should be at least 10, preferably at least 14, nucleotides in length. Intermediate oligonucleotides from 20 to 500, especially 30 to 200, nucleotides in length provide particularly specific and rapid-acting probes. Longer oligonucleotides are also useful, up t texture the full length of the gene. Both RNA and DNA probes can be used.
  • the probes are typically labelled in a detectable manner (e.g., with - ⁇ P, ⁇ H, biotin, or avi- din) and are incubated with single-stranded DNA or RNA from the organism in which a gene is being sought.
  • Hybridization is detected by means of the label after single-stranded and double-stranded (hybridized) DNA (or DNA/RNA) have been separated (typically using nitrocellulose paper).
  • Hybridization techniques suit ⁇ able for use with oligonucleotides are well known.
  • oligo ⁇ nucleotide probe refers to both labeled and unlabeled forms.
  • the inventors have reduced the present invention to practice by isolating and sequencing a cDNA clone for Renilla reniformis luciferase.
  • the deduced amino acid sequence from this cDNA beginning at the first methionine residue, predicts a protein of M r equal to 36 kd, which is the approximate size of native Renilla luciferase.
  • the deduced amino acid sequence also contains within it all six peptide sequences from V-8 protease-digested native Renilla luciferase. Only one mis-match was found between these two sets of amino acid data, a substitution of a tryptophan for a leucine present in the peptide sequence. Comparisions of the native amino acid composition and the predicted recombinant luciferase composition reveal a very high degree of similarity with many identities between specific amino acid residues.
  • Luciferase activity was found in crude extracts of the original luciferase clone ⁇ RLuc-6. Subcloning the cDNA into the vector pTZ18R increased this activity enough to allow the purification of recombinant luciferase from the pTZRLuc-1 cells. Recombinant luciferase can be purified by a much simplified method from that previously used in the purification of native luciferase. The recombinant luciferase functions identically to native luciferase in all aspects analysed thus far.
  • recombinant luciferase Like native, recombinant luciferase has an emission spectrum with a ⁇ max at 480 nm and a shoulder at 400 nm. The absorption spectrum of recombinant luciferase is also identical to that of native. Additionally, both native and recombinant luciferase are very stable at 37°C for several hours as well as having significant stability at 45°C. Using the specific activity determined for native luciferase, protein determinations made based on light emission correlate very well with A280 an( ⁇ Lowry protein determinations, suggesting that the specific activity of recombinant luciferase is similar to, if not the same as, that of native luciferase.
  • amino-terminus amino acid sequence analysis of recombinant luciferase shows an identical sequence to that of the cDNA-predicted amino acid sequence from residues 2 through 18. A significant amount of the recombinant protein is blocked at the amino terminus, probably by N-formyl methionine, which accounts for the inability to determine the amino acid at residue 1.
  • Live Renilla reniformis were collected by bottom trawling in shallow waters off Sapelo Island in the state of Georgia at the University of Georgia Marine Institute. The animals were washed thoroughly in fresh seawater, quick frozen in liquid nitrogen, anc stored at -80°C. Frozen Renilla were crushed to a fine powder under liquid nitrogen with a morter and pestle. The powdered tissue was then homogenized with a Waring blender in 4 M guanidine thiocyanate, and total RNA was isolated as described in Chirgwin e_t al. , Biochemistry (1970) 2 ⁇ :5294-5299.
  • RNA was then passed over an oligo-dT cellulose column to obtain polyadenylated RNA which was stored as an ethanol precipitate at -20°C.
  • Single and double stranded cDNA were synthesized from poly A + RNA by modification of the Gubler and Hoffman method, Gubler et al., Gene
  • ⁇ gtll Library Purified cDNA's were ligated into EcoRI- digested ⁇ gtll. The DNA was then packaged using ⁇ phage extracts (Gigapack Plus Kit, Strategene). Several fractions of the packaged library were titered in Y1088 cells; these fractions ranged from 71% to 81% recombinant phage as determined by the lack of IPTG- inducible ⁇ -galactosidase activity. The total number of recombinant phage was equal to 2.1 X 10° pfu (plaque forming units). The primary library was then amplified in Y1088 cells and stored in 7% DMSO at -80°C. The titer of the amplified library was 2.5 X 10' pfu/ml and was approximately 65% recombinant.
  • Two 17-base oligonucleotide probes were synthesized based on amino acid sequence data from isolated peptides derived from V-8 protease digested, native Renilla luciferase. Shown in Figure 4 are the amino acid sequences of the seven V-8 luciferase peptides. The amino acid sequences with the lowest codon redundancy were selected for synthesis of luciferase oligonucleotide Probe #1 and Probe #2, which are shown highlighted with their derived nucleotide sequences (lower portion of Figure 4). Probe #1 was derived from peptide 7 and contained 32 redundancies, while Probe #2, derived from peptide 1, contained 64 redundancies.
  • the probes were end-labeled with T-4 polynucleotide kinase to high specific activity ⁇ 4-9 X 10° cpm/ ⁇ g ⁇ .
  • Y1088 cells were infected with enough phage to give 3 X 10 4 pfu/plate.
  • the infected cells were plated in 6 ml of top agarose onto 150 mm diameter Luria plates containing 50 ⁇ g/ml ampicillin. After overnight incubation at 37°C, the plates were chilled at 4°C before performing plaque lifts. To eliminate false positive signals, duplicate nitrocellulose filter plaque replicas were prepared from each master plate. Filters were processed by base treatment followed by neutralization in Tris buffer.
  • the filters were air dried and baked at 80°C _in vacuo.
  • Prehybridization was for at least 6 hours 37°C in 6X SSC, 50 mM Sodium Phosphate (pH 6.8), 5X Denhardt's, and 100 ug/ml denatured Herring sperm DNA.
  • Hybridization was overnight at 37°C in prehybridization solution with the addition of dextran sulfate to a final concentration of 10%.
  • the labeled probes were added to the hybridization solution at 1-2 X 10 6 cpm/ml.
  • the initial luciferase cDNA clone, ⁇ RLuc-6 was in the expression vector ⁇ gtll.
  • the clone was ampliflied in Y1088 cells and the high titer stock was used to make lysogens in Y1089.
  • the ⁇ RLuc-6 lysogen was then grown in Luria broth plus ampicillin (50 ⁇ g/ml) at 37°C.
  • the cells were pelleted, resuspended in TE buffer, and lysed with lysozyme (2 mg/ml). The cell debris was then pelleted and the supernatant was assayed for luciferase activity.
  • the 2.2kbp ⁇ RLuc-6 insert which included 1 kb of ⁇ gtll lacZ DNA attached to the 3 ' end was isolated on a low-melt gel and subcloned into the EcoRI/Sstl sites of pTZ18R (Pharmacia). This construct, pTZRLuc-1, was used in the expression and purification of recombinant Renilla luciferase. Electrophoretic and Western Analysis
  • Recombinant luciferase samples were characterized on Commassie-stained SDS-PAGE gels.
  • the gels were run and transferred to nitrocellulose filters at 30 mA in transfer buffer as described in Burnett, N.W., Analytical Biochemistry (1981) n2:195-203.
  • the filters were blocked with 3% BSA and incubated with a 1/1000 dilution of polyclonal rabbit-anti-luciferase antibodies.
  • the filter was washed in TBS and incubated with al/2500 dilution of the secondary antibody, goat-anti-rabbit IgG conjugated to horseradish peroxidase (Bio-Rad).
  • the filter was washed in TBS and developed with HRP-Color Developing reagent (Bio-Rad).
  • the G-100 column was run in IX Renilla Standard Buffer (1.5 mM Tris, 1.0 mM EDTA pH 7.8). The other columns were run in IX buffer and were eluted in 10X buffer (DEAE) or Sodium Benzoate in 10X buffer (Benzoic Acid-Sepharose) . The first Benzoic Acid column was eluted with 0.1 M sodium benzoate pulse. The second Benzoic Acid column was eluted with a 0 to 0.5 M sodium benzoate gradient.
  • IX Renilla Standard Buffer 1.5 mM Tris, 1.0 mM EDTA pH 7.8
  • the other columns were run in IX buffer and were eluted in 10X buffer (DEAE) or Sodium Benzoate in 10X buffer (Benzoic Acid-Sepharose) .
  • the first Benzoic Acid column was eluted with 0.1 M sodium benzoate pulse.
  • the second Benzoic Acid column was eluted with a
  • the primary screen of 1 X 10° recombinant phage resulted in the isolation of nine clones which gave identical autoradiographic signals on both replica filters. Of the nine original positives, only five gave signals on the second screening, and only one of the five hybridized to both probes. The other four hybridized only to Probe #2, which has the greatest sequence redundancy. Restriction enzyme analysis of the five clones revealed that ⁇ RLuc-3 and ⁇ RLuc-8 were identical and contained a 1.16 kb insert. ⁇ RLuc 2, 5, and 6 had insert sizes of 0.8, 2.34 and 1.2 kbp respectively. Only the ⁇ RLuc-3 and ⁇ RLuc-8 inserts could be exercised from the EcoRI cloning site by EcoRI digestion.
  • each of these cDNAs contained 1 kb of ⁇ gtll DNA attached at one end. Since only ⁇ RLuc-6 hybridized to both oligonucleotide probes and contained a cDNA of the size necessary to code for an approximately 36 kd protein, it was chosen for DNA sequence analysis.
  • the 2.2kb EcoRI/Sstl fragment which contained 1 kb of ⁇ gtll lac Z DNA, was subcloned into M13 and mpl8 and mpl9 and both strands of the 1.2 kb cDNA were completely sequenced.
  • the entire cDNA sequence is 1196 bp, excluding the EcoRI linker ( Figure 1). Structurally, it contains a putative initiation codon beginning at nucleotide 10, a stop codon at nucleotide 944, a polyadenylation consensus sequence at nucleotide 1170, and a short polyadenylated tail of seven nucleotides ( Figure 1).
  • FIG. 1 Also shown underlined in Figure 1 are the two oligonucleotide hybrization sites located at nucleotides 537-554 (Probe #1) and nucleotides 820-836 (Probe #2). The loss of the EcoRI site at the 3 1 end of the cDNA was confirmed by the sequence analysis.
  • the cDNA does not contain a stop codon in frame with and upstream from the first initiation codon as an indication that the protein coding region is full length. However, the coding region directs the recombinant systhesis of fully active Renilla luciferase, as discussed below.
  • Translating the cDNA sequence into an amino acid sequence gave conclusive evidence that the ⁇ RLuc-6 cDNA was a Renilla luciferase cDNA.
  • the translated cDNA sequence contains an open reading frame of 314 amino acids ( Figure 2). The first methionine is preceded by three amino acids which may or may not be part of the native protein sequence.
  • pTZRLuc-1 The construct pTZRLuc-1 was made to simplify the isolation of DNA fragments for use as probes in Southern and Northen analysis ( Figure 6). E. coli cells harboring this plasmid are referred to as pTZRLuc-1 cells. Similar to ⁇ gtll, the pTZ series "phagemids" contain a polylinker site adjacent to the lac Z 1 gene. Expressed genes in this vector could potentially be expressed containing the first 10 to 15 amino acids of ⁇ -galactosidase fused to the cDNA translation product. Analysis of pTZRLuc-1 cell supernatants for light emission showed that, relative to ⁇ RLuc-6, high levels of luciferase activity were present. Furthermore, induction of pTZRLuc-1 cells with 0.5 mM IPTG led to an increase in luciferase activity of ⁇ 5-8 fold in crude extracts.
  • the bioluminescence emission spectrum from these crude supernatants was identical to the previously published bioluminescence emission spectrum for native Renilla luciferase.
  • the wavelength distribution of light emission is essentially identical to that reported earlier.
  • the spectrum had an emission maximum ( ⁇ max) at 480 nm with a slight shoulder at 400 nm, which presumably corresponded to the luciferase- oxyluciferin complex neutral species excited state.
  • the pTZRLuc-1 crude supernatants were further characterized by SDS-PAGE.
  • the Coomassie-stained gel contained numerous bands, one of which ran in the vicinity of native luciferase. To confirm that this band was recombinant luciferse, Western analysis was performed using rabbit polyclonal antibodies raised against native Renilla luciferase. The developed Western showed one band that migrated at the same position as native luciferase. No other products indicative of ⁇ -galactosidase-luciferase fusion polypeptide were apparent, suggesting that either any putative fusion protein is in too low a concentration to be detected or, more likely, that no fusion protein is made.
  • any pTZRLuc-1 translation products initiating at the ⁇ -galactosidase ATG start codon within the first three codons immediately adjacent to the first cDNA start codon may explain why we see IPTG induction of luciferase activity without production of a fusion product.
  • IPTG induction of recombinant luciferase indicates that its transcription is directed by the lac Z promoter. Since the only candidate ribosome binding site (RBS) is probably positioned too far (18 nucleo- tides) from the luciferase ATG to be functional, we suspect that a ⁇ -galactosidase peptide is being translated to the stop codon immediately adjacent to the luciferase ATG. The translation of a ⁇ - galactosidase peptide may facilitate ribosome reintitiation at the luciferase ATG codon ( Figure 7). This event could occur if the dinucleotide AG was acting as a RBS for the luciferase cDNA.
  • recombinant luciferase In IPTG induced pTZRLuc-1 cells, recombinant luciferase represents approximately 12-14% of the total protein in the clarified crude supernatant. Although significant losses of recombinant luciferase were suffered in this initial purification, the amount of starting material and time involved made the loss seem insignificant when compared to the purification of native luciferase.
  • the purification scheme for the recombinant Renilla luciferase is shown in Figure 8; the purification is summarized in Table 3. SDS-PAGE analysis of the purification steps shows increasing amounts of recombinant luciferase with respect to contaminating protein.
  • the Benzoic Acid-Sepharose luciferase is approximately 99% pure as evidenced by a single band of M r equal to 34 Kd. Very slight contamination was noticible on the Coomassie stained gel if more than 20 ⁇ g of protein were loaded. 31
  • the absorption spectrum of pure recombinant luciferase is also identical to that of native luciferase. Based on the specific activity of native luciferase, the protein concentration of recombinant luciferase determined by light emission correlated very well with protein concentration based on A 2 gn and Lowry measurements. This result suggests that the specific activity of recombinant luciferase is the same as native.
  • Native Renilla luciferase has been shown previously to exhibit temperature stability at 37°C and 45°C.
  • the recombinant protein has also been analyzed for temperature stability and, like native luciferase, is stable at 37°C for several hours and 45°C for shorter periods of time without significant loss of activity. Stability at these temperatures is an important feature for the utility of recombinant luciferase in diagnostic applications, many of which require incubation at physiological temperatures.

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Abstract

On a isolé et caractérisé du matériel génétique codant la luciférase à partir du coelentéré marin Renilla. Ce matériel génétique permet la production de peptides destinés à être utilisés comme étiquettes dans des essais de bioluminescence ou peut être utilisé directement pour identifier les gènes de luciférase à partir d'organismes apparentés.
PCT/US1991/001614 1991-03-11 1991-03-11 Clonage et expression de renilla luciferase WO1992015673A1 (fr)

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PCT/US1991/001614 WO1992015673A1 (fr) 1991-03-11 1991-03-11 Clonage et expression de renilla luciferase
ES91908378T ES2142801T3 (es) 1991-03-11 1991-03-11 Clonacion y expresion de luciferasa de renilla.
DE69131780T DE69131780T2 (de) 1991-03-11 1991-03-11 Klonierung und expression der luziferase aus renilla
DK91908378T DK0575319T3 (da) 1991-03-11 1991-03-11 Kloning og ekspression af Renilla-luciferase
EP91908378A EP0575319B1 (fr) 1991-03-11 1991-03-11 Clonage et expression de renilla luciferase
CA002105984A CA2105984C (fr) 1991-03-11 1991-03-11 Clonage et expression de la luciferase de renilla
JP03506544A JP3126980B2 (ja) 1991-03-11 1991-03-11 レニラ（ｒｅｎｉｌｌａ）ルシフェラーゼのクローニング及び発現
GR20000400307T GR3032608T3 (en) 1991-03-11 2000-02-09 Cloning and expression of renilla luciferase.

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CA2105984A1 (fr) 1992-09-12
CA2105984C (fr) 2002-11-26
EP0575319A4 (fr) 1995-04-26
ES2142801T3 (es) 2000-05-01
JPH06504903A (ja) 1994-06-09
EP0575319B1 (fr) 1999-11-10
DE69131780D1 (de) 1999-12-16
EP0575319A1 (fr) 1993-12-29
GR3032608T3 (en) 2000-05-31
DK0575319T3 (da) 2000-07-10
JP3126980B2 (ja) 2001-01-22

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